如何从头开始创建自己的 C++ 框架？

#include <iostream>
#include <string>
#include <vector>

using namespace std;

// 定义基础类库
class Request {
public:
    string method;
    string path;
    vector<pair<string, string>> headers;
    string body;
};

class Response {
public:
    string status;
    vector<pair<string, string>> headers;
    string body;
};

// 定义抽象层
class Controller {
public:
    virtual Response handle(const Request& request) = 0;
};

// 定义模块
class UserController : public Controller {
public:
    Response handle(const Request& request) override {
        // 根据请求方法处理用户相关逻辑
        // ...
    }
};

// 创建框架实例
class Framework {
public:
    Framework() {
        // 注册控制器
        controllers["user"] = new UserController();
    }

    Response process(const Request& request) {
        // 找出要调用的控制器
        Controller* controller = controllers[request.path];

        // 如果控制器存在，则处理请求
        if (controller) {
            return controller->handle(request);
        } else {
            // 否则，返回 404 Not Found 响应
            Response response;
            response.status = "404 Not Found";
            return response;
        }
    }

private:
    unordered_map<string, Controller*> controllers;
};